Material and Finish  

Aluminum available in midnight, starlight, silver, pink, and (PRODUCT)RED  
Stainless Steel available in graphite, silver, and gold  

Size and Weight  
45mm by 38mm by 10.7mm (45mm)  
38.7 grams (aluminum, GPS)  
39.0 grams (aluminum, GPS + Cellular)  
51.5 grams (stainless steel)  
 

Chip  
S9 SiP with 64-bit dual-core processor  
W3 Apple wireless chip  
Second-generation Ultra Wideband chip  
4-core Neural Engine  
64GB capacity

Sensors  
Electrical heart sensor  
Third-generation optical heart sensor  
Speaker  
Microphone  
Always-on altimeter  
Compass  
Always-on altimeter  
Waypoints, Backtrack, and Elevation view  
High dynamic range gyroscope  
Ambient light sensor

Health and Wellness  

ECG app  
Nightly wrist temperature tracking  
Cycle Tracking app with retrospective ovulation estimates  
Sleep apnea notifications  
Vitals app featuring heart rate, respiratory rate, wrist temperature, and sleep duration  
Medications app  
Mindfulness app with state of mind tracking  
Training load  
Noise monitoring  
GymKit

Display  
LTPO OLED Always-on Retina display  
Up to 2000 nits brightness  
1 nit minimum brightness  
Up to 3000 nits maximum brightness  
1 nit minimum brightness  
396 by 484 pixels  
1143 sq mm display area